Lead-pencil



(N0.Model.)

P. W. MUSSON.

I LEAD PENCIL.

No. 574,361. Patented Dec. 29, 1896.

UNITED STATES ATENT OFFICE.

FREDERICK W. MUSSON, OF CHICAGO, ILLINOIS.

LEAD-PENCIL.

SPECIFICATION forming part of Letters Patent No. 574,361, dated December29, 1896.

Application filed May 8,1896. Serial No. 590,684. (No model.)

To all whom it may concern.-

Be it known that I, FREDERICK W. MUSSON, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented certain new and useful Improvements in Pencils, of which thefollowing is a specification.

, My invention relates to automatic leadpencils, or a lead-pencil withmovable leads.

It is illustrated in the accompanying drawings, wherein- Figure 1 is aside View of alead-pencil with parts shown in dotted lines. Fig. 2 is alongitudinal section of the end portion of Fig. 1. Fig. 3 is a detail ofthe pencil-point.

Like parts are indicated by the same letters in all the figures.

A is the pencil proper or the pencil-body, which is preferably a woodcylinder having a central bore or chamber. It may be provided with thehead B, carrying the rubber-tip C, but of course this head need not beused, or any other head could be substituted. It also preferably has atthe working point the tip which consists of the collar D, thescrewthreaded exterior tip E, and the wings F F, which connect the twoportions. The collar may or may not be screw-threaded,but the part E ispreferably internally screw-threaded.

G is the screw-threaded lead. In speaking of materials I am notintending to limit myself to the particular materials mentioned, asthese or other materials can be used, but I have suggested what seems tobe the most convenient and satisfactory shape in which my invention canbe used.

The use and operation of my invention will be quite evident, but I willdescribe them briefly.

The pencil is preferably of the ordinary size, shape, and appearance,the wood pencil or body consisting of the ordinary wood pencil with thecylindrical central bore. The leads are similar to ordinary leads,except that they are continuous and of any desired length, preferablyabout the length of the pencil proper, and are screw-threaded externallyfrom end to end. The head of the pencil may be dispensed with or anyhead or cap can be used. The forward or writing portion of the pencilmust be provided with a screwthreaded portion to receive thescrew-threaded lead. It is preferably in the shape of a metal portionsomewhat as indicated, which performs the function of serving as theforward feeding mechanism for the pencil, while at the same time itholds the lead to the wood portion. The wings F slip into suitable slotsin the sides of the forward portion of the wood pencil, and thus byfriction hold the metallic tip with its lead to the holder, and at thesame time prevent the metallic tip from rotating. In this pencil all theparts are fixed and stationary, the lead itself being movable byrotation. The point is taken between the thumb and finger and turned,whereupon the lead is worked forward or backward, as the case mayrequire. The lead may be inserted from the tip of the pencil,andtherefore the head may be solid. Ihave usedthetermscrew-threaded, butmean, of course, always to indicate such construction as would makeparts when rotated on each other reciprocate with relation to eachother. For instance, a spiral groove would answer as well as ascrew-thread, and I use the term screw-threaded in the specification andclaims with this broad meaning.

I claim- 1. I11 a lead-pencil the combination of a cylindrical body witha tip portion consisting of an internally-screw threaded tip and partsreceived into slots in the body so as to hold the tip in position infixed relation to the body, and a screw-threaded free lead to bereceived into the screw-threads on the tip.

2. As a new article of manufacture, a leadpencil with a removable leadconsisting of a case having a longitudinal aperture, a removable andoutwardly-projecting but normallyfixed tip on the case, having aninternallyscrew-threaded aperture of less cross-section than theaperture of the case, and a free lead screw-threaded throughout itslength and received in the tip so that the lead can be reciprocated bybeing rotated, and lead and tip can be removed from the case together.

3. As a new article of manufacture, a leadpencil with a removable lead,consisting of a case having a longitudinal aperture, aremovable andoutwardly-projecting but normallyfixed tip on the case, having aninternallyscrewthreaded aperture, and a free lead screw-threadedthroughout its length and received in the tip so that the lead can bereciprocated by being rotated by hand, and. lead and tip can be removedfrom the case together.

FREDERICK W. MUSSON.

Witnesses:

BERTHA O. SIMS, LILLEY W. J OHNSTONE.

ICC

